import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login.vue'
import Home from '../components/Home.vue'
import Welcome from '../components/Welcome.vue'
import Users from '../components/user/Users.vue'
import Rights from '../components/power/Rights.vue'
import Roles from '../components/power/Roles.vue'
import Cate from '../components/goods/Cate.vue'
import CateParams from '../components/goods/CateParams.vue'
import Goods from '../components/goods/List.vue'
import GoodsAdd from '../components/goods/Add.vue'

Vue.use(VueRouter)

//在VUE中路由遇到Error: Avoided redundant navigation to current location:报错显示是路由重复，
const originalPush = VueRouter.prototype.push
VueRouter.prototype.push = function push(location) {
  return originalPush.call(this, location).catch(err => err)
}

const routes = [
  { path: '/', redirect: '/login' },
  { path: '/login', component: Login },
  {
    path: '/home',
    component: Home,
    redirect: '/welcome',
    children: [
       {path: '/welcome', component: Welcome},
       {path: '/users', component: Users},
       {path: '/rights', component: Rights},
       {path: '/roles', component: Roles},
       {path: '/categories', component: Cate},
       {path: '/cateparams', component: CateParams},
       {path: '/goods', component: Goods},
       {path: '/goods/add', component: GoodsAdd}
    ]
  }
]

const router = new VueRouter({
  routes
})

//挂载导航守卫
router.beforeEach((to,from,next)=>{
//  to 代表将要访问的路径
//  from 代表从哪个路径跳转而来
//  next 是一个函数，表示放行
//   next()放行  next('/login')
  if(to.path === '/login') return next()
//  获取token
  const tokenStr=window.sessionStorage.getItem('token')
  if(!tokenStr) return next('/login')
  next()
})


export default router
